填must.
后面有表示原因的推断.所以这里是肯定.because的原因是最强的.所以是很肯定的推断.
that man _____ be the headmaster ,because he always stands here at this time.（填适当的情态动词）
that man _____ be the headmaster ,because he always stands here at this time.（填适当的情态动词）
英语人气：700 ℃时间：2019-08-21 12:54:29
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